CN102503455A - Castable cordierite-mullite refractory material and production technique thereof - Google Patents

Castable cordierite-mullite refractory material and production technique thereof Download PDF

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Publication number
CN102503455A
CN102503455A CN2011103197041A CN201110319704A CN102503455A CN 102503455 A CN102503455 A CN 102503455A CN 2011103197041 A CN2011103197041 A CN 2011103197041A CN 201110319704 A CN201110319704 A CN 201110319704A CN 102503455 A CN102503455 A CN 102503455A
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mullite
commercially available
magnesia
refractory
castable
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CN2011103197041A
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CN102503455B (en
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袁林
王杰曾
杨圣玮
于龙泉
刘锡俊
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RUITAI TECHNOLOGY Co Ltd
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RUITAI TECHNOLOGY Co Ltd
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Abstract

The invention relates to a castable cordierite-mullite refractory material which is prepared from 20-40% of 1.2-0.5mm molochite, 10-25% of 0.5-0.088mm molochite, 0-15% of 0.5-0.088mm synthetic cordierite, 10-35% of <0.088mm synthetic cordierite, 0-20% of <0.088mm synthetic mullite, 1-3% of magnesia micropowder, 2-8% of alumina micropowder, 3-10% of silica fume, 0-15% of calcined kaolin micropowder, 0.01-0.1% of additional third-generation water reducing agent and 4-8% of additional water. The production technique comprises the following steps: proportionally weighing the raw materials, mixing, and forming to obtain a green body; and standing for 12-24 hours to demold, curing at normal temperature for 1-3 days, drying at 40-60 DEG C for 1-2 days, and firing at 1150-1350 DEG C. The invention uses <10 mu m magnesia micropowder instead of common magnesia fine powder, adopts high-purity raw materials to improve the high-temperature properties, adopts abundant synthetic raw materials to reduce the firing shrinkage, and adds proper micropowder to widen the sintering temperature range, thereby solving the contradictions between low magnesia amount and high setting rate, between special shapes and dimensions and low manufacturing cost and between the difficulty in sintering and high performance. The invention develops a novel easy-forming easy-sintering technique, and prepares a refractory material product which has the advantages of special shapes and dimensions, high purity, high strength, high temperature resistance and good thermal shock resistance.

Description

Castable dichroite-mullite refractory materials and production technique thereof
Technical field
The present invention relates to fire-resistant refractory materials of a kind of castable dichroite-mullite and production technique thereof; Have be easy to be shaped, to be easy to maintenance, be easy to the agglomerating advantage, products made thereby has the purity height, intensity is big, high temperature resistant and the characteristic of good thermal shock, is suitable for making large-scale, special shape fire resistive material product.
Background technology
The advanced ceramics kiln has extensively adopted high-speed burning cup, air-flow stirring, air quenching to accelerate the heat exchange between the gas-solid in the kiln; The frame supports blank that adopts pillar-crossbeam-refractory slab to form is so that kiln gas directly contacts with blank; Adopt the kiln furniture material of low accumulation of heat, HS, high heat conduction and high-heat resistance shock resistant, with weight that alleviates kiln furnitures and the accumulation of heat that reduces kiln furnitures; Ultralight matter, the kiln car of low accumulation of heat and the kiln body of high insulation have been adopted, to reduce heat radiation through the kiln body.Like this, significantly strengthened effective heat transfer, reduced invalid heat transfer, Technological Economies such as the output of pottery kiln, burnup, cost, life-span refer to greatly improved.
The ceramic industry dichroite-mullite fire resistive material product that is widely used.Generally; The dichroite-mullite fire resistive material product is an aggregate with Lip river Kate (a kind of mullite-vagcor compound material) not, is matrix with talcum, clay, aluminum oxide, adds entry and a small amount of chemical admixture; The back plastic state of mixing is shaped with the mode of mold pressing, extruding.Perhaps, add more water, become fluidised form behind the mix, be shaped with gypsum mold.The shortcoming of above technology is: the mode of pressing with machine is shaped, and shape of products, size are restricted, and can not make large-scale, special shape fire resistive material product; Be shaped with gypsum mold, demould time is long, production efficiency is low.Also have, blank strength is low, sintering temperature is narrow, often produces a large amount of waste products because of breakage, burning, underburnt.
Some medium and small ladles use magnalium matter mould material.This refractory materials adopts magnesia, silicon ash as wedding agent, and normal temperature utilizes MgO-SiO 2-H 2The hydration reaction of O system produces and combines, and high temperature forms magnesium-aluminium spinel (molecular formula is MA)-forsterite (molecular formula M through solid state reaction 2S)-periclasite (molecular formula M) matrix combines the tissue of alumina aggregate, thereby has certain resistivity against fire and resistance to fouling.Receive the inspiration of refractory magnesia-alumina mould material, some utilize magnesia, silicon ash, alumina powder, calcined kaolin as raw material, and normal temperature utilizes MgO-SiO 2-H 2The hydration reaction of O system produces and combines, and forms trichroite (M after the thermal treatment 2A 2S 5) matrix produce to combine, thereby prepare the dichroite-mullite refractory product of castable.But the disadvantage of this technology is that curing speed is slow, curing time is long, demoulding strength is low, particularly can't organize production winter, thereby does not almost have practical value.
Magnesium silicon is aquation material (MgO-SiO 2-H 2O) can successfully be used for the magnalium matter mould material of Iron And Steel Industry, but be difficult to use in the dichroite-mullite castable refractory materials of ceramic industry, mainly be to combine the chemical constitution of phase different.The main combination of Iron And Steel Industry magnalium matter mould material is forsterite mutually.The chemical formula of forsterite is M 2S, weight percent (down together) MgO=57.1%, SiO 2=42.9%.So magnalium matter mould material can account in the matrix of refractory materials gross weight about 30%, add the magnesia that accounts for total amount 10%, rely on a large amount of MgO that add, form abundant hydrate, setting time and demoulding strength that acquisition needs.But the combination of dichroite-mullite refractory product is trichroite mutually.The molecular formula of trichroite is M 2A 2S 5, contain Natural manganese dioxide 13.79%, aluminum oxide 34.86%, silicon oxide 51.35%.Hence one can see that: the MgO content of trichroite is less than 1/4 of forsterite, thereby the dichroite-mullite refractory materials of castable can not obtain the rate of set and the sufficiently high demoulding strength of enough pieces through adding a large amount of magnesia to the alumina-magnesia castable that kind.Therefore, castable dichroite-mullite refractory materials must solve after the contradiction that the magnesia add-on is little and curing time is short, just really has practical value.
Summary of the invention
The objective of the invention is to, study a kind of castable dichroite-mullite refractory materials and production technique thereof.Magnesia is a kind of Natural manganese dioxide through the high temperature dead roasting, and water at normal temperature speed is very slow, for the 325 order magnesia powders that routine is used, particle diameter<44 μ m.With in the alumina-magnesia castable, magnesia is that aquation has taken place on the surface in steel and iron industry, but inside does not have aquation, thereby needs to introduce the hyrate that a large amount of magnesia could form sufficient amount.For castable dichroite-mullite refractory materials,, can improve the hydration activity of magnesia though can not introduce a large amount of Natural manganese dioxide.If improved hydration activity; Just can accelerate hydration rate; Just can solve the low magnesium oxide add-on; Obtain the performance of rapid coagulation and high demoulding strength, thereby solve the slow problem of setting rate, develop castable dichroite-mullite refractory materials and production technique thereof with practical value.Technology of the present invention is simple, easily manufactured, have be easy to be shaped, be easy to maintenance, be easy to the agglomerating advantage, the products made thereby good looking appearance, have the purity height, intensity is big, high temperature resistant and the characteristic of good thermal shock.
For realizing invention, the present invention will use particle diameter to replace 325 order magnesia powders of use at present less than the magnesia micro mist of 10 μ m.Simultaneously, take a series of technical measures to improve the use characteristics and the use properties of refractory materials.These technical measures have:
1) a large amount of raw materials that adopt through pyroprocessing like not Lip river Kate, synthesis of dichroite, mullite synthesizing, calcined kaolin etc., reduce sintering and shrink, and improve the sintering qualified rate of refractory product;
2) use ultrafine particles such as silicon ash, alumina powder, calcined kaolin micro mist in a large number, reduce firing temperature, enlarge sintering range, reduce living burning, distortion etc. and burn till defective;
3) use the higher raw material of purity,, reduce raw material and bring amount of impurities into, improve the high-temperature behavior of trichroite matrix like HIGH-PURITY SILICON ash, calcined kaolin micro mist;
4) use third generation water reducer, replace defloculating agent and water reducers such as the conventional tripoly phosphate sodium STPP that uses, Sodium hexametaphosphate 99, ZX-I, sodium naphthalene sulfonate, reduce Na ion introducing amount, improve the high-temperature behavior of trichroite matrix.
In view of above design, the weight percent compatibility of castable dichroite-mullite refractory materials is:
Said not Lip river Kate is a kind of commercially available mullite-vagcor composite fire raw material that makes through calcining.
Said synthesis of dichroite is commercially available refractory raw material of the same name.
Said mullite synthesizing is the commercially available refractory raw material of artificial synthetic mullite by name.
The ultrafine powder of said magnesia micro mist for making by the commercially available magnesia of MgO >=96%, its<weight percent of 10 μ m part accounts for more than 90% of total amount.
Said alumina powder is commercially available refractory raw material of the same name, its<weight percent of 6 μ m part accounts for more than 90% of total amount.
Said silicon ash is commercially available refractory raw material of the same name, its SiO 2Content>=93%, granularity accounts for more than 80% of total amount for the weight percent of<1 μ m part.
Said calcined kaolin micro mist is commercially available refractory raw material of the same name, its Al 2O 3+ SiO 2Content>=96%, granularity accounts for more than 90% of total amount for the weight percent of<10 μ m part.
Said third generation water reducer is commercially available polycarboxylic acid series building concrete water reducer.
Each raw material is by above proportioning weighing; Make base substrate through mixing, being shaped; Place the 12-24h demoulding, normal temperature maintenance 1-3 days was through 40-60 ℃ of dry 1-2 days; Burn till through 1150-1350 ℃, after surface treatment and check, make the large-scale or special odd-shaped dichroite-mullite fire resistive material product of castable again.
Embodiment
Embodiment 1
Adopt not Lip river Kate 40% of 1.2-0.5mm, 0.5-0.088mm is Lip river Kate 10% not, 0.5-0.088mm synthesis of dichroite 10%;<0.088mm synthesis of dichroite 15%,<0.088mm mullite synthesizing 11%, magnesia micro mist 2%; Alumina powder 5%, the proportioning of silicon ash 7% adds third generation water reducer 0.05%; Water 6% back companion with, obtain the slurry of good fluidity.After the shaping, slurry condensed in 1 hour, solidified in 2 hours; Through the maintenance demoulding in 24 hours, dry through 60 ℃ * 24H, warp thermal treatment in 1250 ℃ * 6 hours made and has regular profile again; And strength at normal temperature reaches 18MPa, and 1250 ℃ of hot modulus of rupture reach the refractory materials of 16MPa.The technology of invention is simple, easily manufactured, the products obtained therefrom good looking appearance, and physicals is good, and invention has realized purpose.
Embodiment 2
Adopt not Lip river Kate 30% of 1.2-0.5mm, 0.5-0.088mm is Lip river Kate 20% not, 0.5-0.088mm synthesis of dichroite 5%;<0.088mm synthesis of dichroite 23%,<0.088mm mullite synthesizing 2%, magnesia micro mist 3%; Alumina powder 5%, silicon ash 7%, the proportioning of calcined kaolin 5%; Add third generation water reducer 0.07%, water 6% back companion with, obtain the slurry of good fluidity.After the shaping, slurry condensed in 1 hour, solidified in 2 hours; Through the maintenance demoulding in 12 hours, dry through 60 ℃ * 24H, warp thermal treatment in 1200 ℃ * 6 hours made and has regular profile again; And strength at normal temperature reaches 16MPa, and 1200 ℃ of hot modulus of rupture reach the refractory materials of 12MPa.The technology of invention is simple, easily manufactured, the products obtained therefrom good looking appearance, and physicals is good, and invention has realized purpose.

Claims (2)

1. castable dichroite-mullite refractory materials, it is characterized in that: the weight percent compatibility of said refractory materials is:
Said not Lip river Kate is a kind of commercially available mullite-vagcor composite fire raw material that makes through calcining; Said synthesis of dichroite is commercially available refractory raw material of the same name; Said mullite synthesizing is the commercially available refractory raw material of artificial synthetic mullite by name; The ultrafine powder of said magnesia micro mist for making by the commercially available magnesia of MgO>=96%, its<weight percent of 10 μ m part accounts for more than 90% of total amount; Said alumina powder is commercially available refractory raw material of the same name, its<weight percent of 6 μ m part accounts for more than 90% of total amount; Said silicon ash is commercially available refractory raw material of the same name, its SiO 2Content>=93%, granularity accounts for more than 80% of total amount for the weight percent of<1 μ m part; Said calcined kaolin micro mist is commercially available refractory raw material of the same name, its Al 2O 3+ SiO 2Content>=96%, granularity accounts for more than 90% of total amount for the weight percent of<10 μ m part; Said third generation water reducer is commercially available polycarboxylic acid series building concrete water reducer.
2. production technique of making the said refractory materials of claim; It is characterized in that: each raw material makes base substrate by above proportioning weighing through mixing, being shaped, and places the 12-24h demoulding; Normal temperature maintenance 1-3 days; Through 40-60 ℃ of dry 1-2 days, burn till through 1150-1350 ℃, after surface treatment and check, make the large-scale or special odd-shaped dichroite-mullite fire resistive material product of castable again.
CN201110319704.1A 2011-10-12 2011-10-12 Castable cordierite-mullite refractory material and production technique thereof Active CN102503455B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104230290A (en) * 2014-09-02 2014-12-24 新疆天山水泥股份有限公司 Black-body cement capable of accumulating heat and preparation method thereof
CN108218468A (en) * 2018-01-31 2018-06-29 郑州大学 A kind of hot pressing furnace lightweight composite ceramic material and preparation method thereof
CN108569907A (en) * 2018-06-12 2018-09-25 中钢集团洛阳耐火材料研究院有限公司 A kind of preparation method of Catofin dehydrogenating propanes reactor refractory material
CN109320224A (en) * 2018-10-26 2019-02-12 淄博工陶耐火材料有限公司 A kind of material and preparation method thereof of high-purity cordierite combination mullite

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101134676A (en) * 2006-08-30 2008-03-05 宝山钢铁股份有限公司 Fire resistive material for coke oven door
CN101367666A (en) * 2008-09-28 2009-02-18 瑞泰科技股份有限公司 Large-scale, specially shaped mullite-corundum system sintered refractory material product and preparing technique thereof
CN101585710A (en) * 2008-05-23 2009-11-25 宝山钢铁股份有限公司 Refractory material for coal loading port of coke oven

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101134676A (en) * 2006-08-30 2008-03-05 宝山钢铁股份有限公司 Fire resistive material for coke oven door
CN101585710A (en) * 2008-05-23 2009-11-25 宝山钢铁股份有限公司 Refractory material for coal loading port of coke oven
CN101367666A (en) * 2008-09-28 2009-02-18 瑞泰科技股份有限公司 Large-scale, specially shaped mullite-corundum system sintered refractory material product and preparing technique thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104230290A (en) * 2014-09-02 2014-12-24 新疆天山水泥股份有限公司 Black-body cement capable of accumulating heat and preparation method thereof
CN104230290B (en) * 2014-09-02 2016-06-29 新疆天山水泥股份有限公司 A kind of can the black matrix cement and preparation method thereof of accumulation of heat
CN108218468A (en) * 2018-01-31 2018-06-29 郑州大学 A kind of hot pressing furnace lightweight composite ceramic material and preparation method thereof
CN108569907A (en) * 2018-06-12 2018-09-25 中钢集团洛阳耐火材料研究院有限公司 A kind of preparation method of Catofin dehydrogenating propanes reactor refractory material
CN109320224A (en) * 2018-10-26 2019-02-12 淄博工陶耐火材料有限公司 A kind of material and preparation method thereof of high-purity cordierite combination mullite

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Application publication date: 20120620

Assignee: YIXING RUITAI REFRACTORY MATERIAL CO., LTD.

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Denomination of invention: Castable cordierite-mullite refractory material and production technique thereof

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Record date: 20141230